Iec 61850-3-2013.Pdf

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Edition 2.0 2013-12

INTERNATIONAL
STANDARD
NORME
INTERNATIONALE

Communication networks and systems for power utility automation –
Part 3: General requirements

IEC 61850-3:2013

Réseaux et systèmes de communication pour l'automatisation
des systèmes électriques –
Partie 3: Exigences générales

Copyrighted material licensed to BR Demo by Thomson Reuters (Scientific), Inc., subscriptions.techstreet.com, downloaded on Nov-27-2014 by James Madison. No further reproduction or distribution is permitted. Uncontrolled when printe

IEC 61850-3

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THIS PUBLICATION IS COPYRIGHT PROTECTED

®

Edition 2.0 2013-12

INTERNATIONAL
STANDARD
NORME
INTERNATIONALE

Communication networks and systems for power utility automation –
Part 3: General requirements

Réseaux et systèmes de communication pour l'automatisation
des systèmes électriques –
Partie 3: Exigences générales

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE

PRICE CODE
CODE PRIX

ICS 33.200

XB

ISBN 978-2-8322-1216-5

Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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IEC 61850-3

61850-3 © IEC:2013

CONTENTS
FOREWORD ........................................................................................................................... 5
1

Scope .............................................................................................................................. 7

2

Normative references ...................................................................................................... 7

3

Terms, definitions and abbreviations ............................................................................... 9

4

3.1
Terms and definitions ......................................................................................... 9
3.2
Abbreviations ................................................................................................... 20
Environmental conditions ............................................................................................... 20

5

4.1
General ............................................................................................................ 20
4.2
Normal environmental conditions ..................................................................... 20
4.3
Special environmental conditions ..................................................................... 21
4.4
Storage conditions ........................................................................................... 22
Ratings .......................................................................................................................... 22
5.1
5.2

6

General ............................................................................................................ 22
Rated voltage – Auxiliary energizing voltage .................................................... 22
5.2.1
AC voltage ...................................................................................... 22
5.2.2
DC voltage...................................................................................... 22

5.2.3
Operating range .............................................................................. 22
Binary input and output .................................................................................... 22
5.3
5.3.1
Binary input .................................................................................... 22
5.3.2
Binary output .................................................................................. 22
Rated burden ................................................................................................... 22
5.4
5.5
Rated ambient temperature .............................................................................. 22
Design and construction ................................................................................................ 23
6.1

6.2

6.3

6.4
6.5
6.6

Marking ............................................................................................................ 23
6.1.1
General .......................................................................................... 23
6.1.2
Identification ................................................................................... 23
6.1.3
Auxiliary supplies, I/O ..................................................................... 23

6.1.4
Fuses ............................................................................................. 24
6.1.5
Terminals and operating devices .................................................... 25
6.1.6
Equipment protected by double or reinforced insulation .................. 25
6.1.7
Batteries ......................................................................................... 26
6.1.8
Test voltage marking ...................................................................... 27
6.1.9
Warning markings ........................................................................... 28
6.1.10
Marking durability ........................................................................... 29
Documentation ................................................................................................. 29
6.2.1
General .......................................................................................... 29
6.2.2
Equipment ratings ........................................................................... 29
6.2.3
Equipment installation .................................................................... 30
6.2.4
Equipment commissioning and maintenance ................................... 31
6.2.5
Equipment operation ....................................................................... 31
Packaging ........................................................................................................ 31
6.3.1
General .......................................................................................... 31
6.3.2
Marking of packaging ...................................................................... 32

Dimensions ...................................................................................................... 32
Functional performance requirements .............................................................. 32
Product safety requirements ............................................................................ 32

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–2–

–3–

6.6.1
6.6.2
6.6.3
6.6.4
6.6.5
6.6.6

7

Clearances and creepage distances ............................................... 32
IP rating .......................................................................................... 34
Impulse voltage .............................................................................. 34
AC or d.c. dielectric voltage test ..................................................... 36
Protective bonding resistance ......................................................... 39
Flammability of insulation materials, components and fire
enclosure ........................................................................................ 39
6.6.7
Single-fault condition ...................................................................... 41
Electromagnetic compatibility (EMC) ................................................................ 44

6.7
6.7.1
General .......................................................................................... 44
6.7.2
Electromagnetic environment .......................................................... 45
6.7.3
Immunity requirements and type tests ............................................. 45
6.7.4
Emission requirements and type tests ............................................. 54
Burden test ...................................................................................................... 55
6.8
6.8.1
Burden for AC power supply ........................................................... 55
6.8.2
Burden for DC power supply ........................................................... 55
6.8.3
Burden for binary input ................................................................... 55
Climatic performance ....................................................................................... 55
6.9
6.9.1
General .......................................................................................... 55
6.9.2
Verification procedure ..................................................................... 56
6.9.3
Climatic environmental tests ........................................................... 57
Mechanical performance .................................................................................. 61
6.10
6.10.1
Vibration response and endurance (sinusoidal) ............................... 61
6.10.2

Shock response, shock withstand and bump ................................... 61
6.10.3
Seismic ........................................................................................... 61
Enclosure protection ........................................................................................ 62
6.11
Tests ............................................................................................................................. 62
7.1
7.2
7.3
7.4
7.5

8

General ............................................................................................................ 62
Test reference conditions ................................................................................. 62
Device reliability classes .................................................................................. 62
Communication conditions during tests ............................................................ 62
Conditions to be met (acceptance criteria) ....................................................... 63
7.5.1
General .......................................................................................... 63
7.5.2
Conditions to be met by class 1 and class 2 devices ....................... 63
7.5.3
Additional condition to be met by class 1 devices ........................... 63
7.5.4
Additional condition to be met by class 2 devices ........................... 63
7.5.5
Equipment functioning .................................................................... 64
7.5.6

Exceptions ...................................................................................... 64
Test overview................................................................................................... 64
7.6
7.7
Test report content ........................................................................................... 65
Marking, labelling and packaging ................................................................................... 66

9

Rules for transport, storage, installation, operation and maintenance ............................ 66

10

Product documentation .................................................................................................. 66

Bibliography .......................................................................................................................... 67
Figure 1 – Example of power station and substation: selection of the specifications for
apparatus and related connections ....................................................................................... 47
Figure 2 – Example air-insulated substation (AIS): selection of the specifications for
apparatus and related connections ....................................................................................... 49

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61850-3 © IEC:2013

61850-3 © IEC:2013

Table 1 – Normal environmental conditions ........................................................................... 21
Table 2 – Special environmental conditions .......................................................................... 21

Table 3 – Symbols ................................................................................................................ 26
Table 4 – Symbols and marking of test voltage(s) ................................................................. 28
Table 5 – Current levels in normal operational condition ....................................................... 34
Table 6 – Charge of energy of capacitance levels ................................................................. 34
Table 7 – AC test voltages .................................................................................................... 38
Table 8 – Current levels in single fault condition ................................................................... 44
Table 9 – Immunity specification – Enclosure port ................................................................. 49
Table 10 – Immunity specifications – Signal ports ................................................................. 50
Table 11 – Immunity specifications – Low voltage a.c. input power ports and low
voltage a.c. output power ports ............................................................................................. 51
Table 12 – Immunity specifications – Low voltage d.c. input power ports and low
voltage d.c. output power ports ............................................................................................. 52
Table 13 – Immunity specifications – Functional earth port ................................................... 53
Table 14 – Emission tests – Auxiliary power supply port ....................................................... 54
Table 15 – Emission tests – Telecommunication port ............................................................ 54
Table 16 – Emission tests below 1 GHz – Enclosure port at a measuring distance of
10 m ..................................................................................................................................... 54
Table 17 – Emission tests above 1 GHz – Enclosure port at a measuring distance of
3 m ...................................................................................................................................... 54
Table 18 – Dry heat test operational ..................................................................................... 57
Table 19 – Cold test operational ........................................................................................... 58
Table 20 – Dry heat test maximum storage temperature ....................................................... 58
Table 21 – Cold test minimum storage temperature .............................................................. 59
Table 22 – Change of temperature test ................................................................................. 59
Table 23 – Damp heat steady state test ................................................................................ 60
Table 24 – Damp heat cyclic test ......................................................................................... 61
Table 25 – Test reference conditions .................................................................................... 62
Table 26 – Device communications profiles (conditions) during tests for Ethernet
equipment with specified ranges of frame size (for example, an Ethernet switch) .................. 63
Table 27 – Device communications profiles (conditions) during tests for serial devices

without specified ranges of frame size (for example, serial media converters) ....................... 63
Table 28 – Test overview ...................................................................................................... 64

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–4–

–5–

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMMUNICATION NETWORKS AND
SYSTEMS FOR POWER UTILITY AUTOMATION –
Part 3: General requirements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61850-3 has been prepared by IEC technical committee 57: Power
systems management and associated information exchange system.
This second edition cancels and replaces the first edition published in 2002. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) requirements are in line with those of other equipment used in the same environment (e.g.
protection relays);
b) product safety added based on IEC 60255-27;
c) EMC requirements completed and in line with IEC 60255 series and IEC 61000-6-5.

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61850-3 © IEC:2013

61850-3 © IEC:2013

The text of this standard is based on the following documents:
FDIS

Report on voting

57/1391/FDIS

57/1416/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this standard, the following print types are used:
–

compliance statements: in italic type;

–

markings: in bold type and caps.

A list of all parts in the IEC 61850 series, published under the general title Communication

networks and systems for power utility automation, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "" in the data
related to the specific publication. At this date, the publication will be
•
•
•
•

reconfirmed,
withdrawn,
replaced by a revised edition, or
amended.

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–6–

–7–

COMMUNICATION NETWORKS AND
SYSTEMS FOR POWER UTILITY AUTOMATION –
Part 3: General requirements

1

Scope

This part of IEC 61850 defines the general requirements, mainly regarding construction,

design and environmental conditions for utility communication and automation IEDs and
systems in power plant and substation environments. These general requirements are in line
with requirements for IEDs used in similar environments, for example measuring relays and
protection equipment.
When communication or automation IEDs are an integral part of another device in the power
plant or substation, then the environmental requirements for the device itself apply to the
communications equipment.

2

Normative references

The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-2-1:2007, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-14:2009, Environmental testing – Part 2-14: Tests – Test N: Change of
temperature
IEC 60068-2-30:2005, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12 h + 12 h cycle)
IEC 60068-2-78:2001, Environmental testing – Part 2-78: Tests – Test Cab: Damp
heat,steady state
IEC 60255-21-1, Electrical relays – Part 21: Vibration, shock, bump and seismic tests on
measuring relays and protection equipment – Section 1: Vibration tests (sinusoidal)
IEC 60255-21-2, Electrical relays – Part 21: Vibration, shock, bump and seismic tests on
measuring relays and protection equipment – Section 2: Shock and bump tests
IEC 60255-21-3, Electrical relays – Part 21: Vibration, shock, bump and seismic tests on
measuring relays and protection equipment – Section 3: Seismic tests

IEC 60255-27:2013, Measuring relays and protection equipment – Part 27: Product safety
requirements
IEC 60417, Graphical symbols for use on equipment. Available from <o/equipment>

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61850-3 © IEC:2013

61850-3 © IEC:2013

IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical
flame test methods
IEC 60825-1, Safety of laser products – Part 1: Equipment classification and requirements
IEC 60990:1999, Methods of measurement of touch current and protective conductor current
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) –
measurement techniques – Electrostatic discharge immunity test

Part

4-2:

Testing

and

IEC 61000-4-3:2008, Electromagnetic compatibility (EMC) – Part 4-3: Testing and

measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4:2004, Electromagnetic compatibility (EMC) – Part
measurement techniques – Electrical fast transient/burst immunity test

4-4:

Testing

and

IEC 61000-4-5:2005, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement techniques – Surge immunity test
IEC 61000-4-6:2008, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-4-8:2001, Electromagnetic compatibility (EMC) – Part 4-8:
measurement techniques – Power frequency magnetic field immunity test

Testing

and

IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and measurement techniques – Voltage dips, short interruptions and voltage variations immunity tests
IEC 61000-4-16:2002, Electromagnetic compatibility (EMC) – Part 4-16: Testing and measurement techniques – Test for immunity to conducted, common mode disturbances in the
frequency range 0 Hz to 150 kHz
IEC 61000-4-17:2009, Electromagnetic compatibility (EMC) – Part 4-17: Testing and measurement techniques – Ripple on d.c. input power port immunity test
IEC 61000-4-18:2006, Electromagnetic compatibility (EMC) – Part 4-18: Testing and measurement techniques – Damped oscillatory wave immunity test
IEC 61000-4-29:2000, Electromagnetic compatibility (EMC) – Part 4-29: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations on d.c.
input power port immunity tests
IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control and

laboratory use – Part 1: General requirements
IEC 61180-1:1992, High-voltage test techniques for low voltage equipment – Part 1:
Definitions, test and procedure requirements
IEC 61180-2, High-voltage test techniques for low-voltage equipment – Part 2: Test
equipment

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–8–

–9–

IEC 61850 (all parts), Communication networks and systems in substations
IEC/TS 61850-2:2003, Communication networks and systems in substations – Part 2:
Glossary
IEC 62271-1, High-voltage switchgear and controlgear – Part 1: Common specifications
CISPR 22:2008, Information technology equipment – Radio disturbance characteristics –
Limits and methods of measurement
CISPR 24:2010, Information technology equipment – Immunity characteristics – Limits and
methods of measurement
ISO 780:1997, Packaging – Pictorial marking for handling of goods
ISO 7000, Graphical symbols for use on equipment – Registered symbols. Available from
<o/equipment>
ISO 9772, Cellular plastics – Determination of horizontal burning characteristics of small
specimens subjected to a small flame
IEEE 1613:2009, IEEE standard environmental and testing requirements for communications
networking devices installed in electric power substations

3

3.1

Terms, definitions and abbreviations
Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61850-2, as well as
the following, apply.
3.1.1
accessible part
part which can be touched in normal operational use with a standard rigid or jointed test finger
as specified in IEC 60529
Note 1 to entry: Accessible in normal operational use applies mainly to the front of the equipment only, for the
purposes of this standard.
Note 2 to entry: A communication circuit/network, which may be connected and taken outside of the cubicle
housing, the equipment, or on the front of the panel without the need to open a cover or flap to access it, should be
considered to be accessible, i.e. should be PEB, PELV, SELV or equivalent.

[SOURCE: IEC 60050-442:1998, 442-01-15, modified — Notes 1 and 2 to entry have been
added.]
3.1.2
adjacent circuits
electric circuits which are separated from the considered circuit by the necessary basic or
double/reinforced insulation
Note 1 to entry:
to be adjacent.

Circuits which are separated by far more than double or reinforced insulation are not considered

[SOURCE: IEC 60255-27:2013, 3.2]

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61850-3 © IEC:2013

61850-3 © IEC:2013

3.1.3
ambient air temperature
temperature, determined under prescribed conditions, of the air surrounding the complete
equipment
Note 1 to entry:

For equipment installed inside an enclosure, it is the temperature of the air outside the enclosure.

Note 2 to entry: The ambient temperature is measured at half the distance from any neighbouring equipment, but
not more than 300 mm distance from the equipment case, at middle height of the equipment, protected from direct
heat radiation from the equipment.

[SOURCE: IEC 60255-27:2013, 3.3]
3.1.4
automation
automation system
use of control systems and information technologies to reduce the need for human work in the
production, transportation and distribution of energy
3.1.5
barrier
electrically protective barrier
part providing protection against direct contact from any usual direction of access
Note 1 to entry:

Barriers may provide protection against the spread of fire (see Clause 7).

[SOURCE: IEC 60050-826:2004, 826-12-23, modified — Note 1 to entry has been added.]
3.1.6
basic insulation
insulation of hazardous live parts which provides basic protection
Note 1 to entry:

This concept does not apply to insulation used exclusively for functional purposes.

[SOURCE: IEC 60050-826:2004, 826-12-14]
3.1.7
bounding surface
outer surface of the equipment case, considered as though metal foil were pressed into
contact with accessible surfaces of insulating material
[SOURCE: IEC 60255-27:2013, 3.6]
3.1.8
class I equipment
equipment with basic insulation as provision for basic protection against electric shock and
protective bonding as provision for fault protection, such that conductive parts on the outside
of the equipment case, cannot become live in the event of a failure of the basic insulation
[SOURCE: IEC 60255-27:2013, 3.7]
3.1.9
class II equipment
equipment with
•

basic insulation as provision for basic protection against electric shock, and

•

supplementary insulation as provision for fault protection; or

•

in which basic protection and fault protection are provided by reinforced insulation

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– 10 –

– 11 –

Note 1 to entry: There should be no provision for a protective conductor or reliance upon installation conditions
for safety purposes. It is, however, permissible to connect an earth/ground conductor to Class II equipment for
functional (for example, EMC) purposes.

[SOURCE: IEC 60255-27:2013, 3.8]
3.1.10
class III equipment
equipment, or parts of an equipment, in which protection against electric shock relies upon
supply from SELV or PELV circuits and in which hazardous voltages are not generated
[SOURCE: IEC 60255-27:2013, 3.9]
3.1.11
clearance
shortest distance, measured in air, between two conductive parts, or between a conductive
part and the outer bounding surface of the equipment, whether conductive or not
[SOURCE: IEC 60255-27:2013, 3.10]

3.1.12
comparative tracking index
CTI
numerical value of the maximum voltage in volts which a material can withstand without
tracking under specified test conditions
[SOURCE: IEC 60050-212:2010, 212-11-59]
3.1.13
communication circuit
communication network
circuit/network for receiving and/or transmitting, digital or analogue signals
Note 1 to entry: It may communicate with other circuits via optical, magnetic or electromagnetic radiation means,
or metallic connections.

[SOURCE: IEC 60255-27:2013, 3.12]
3.1.14
creepage distance
shortest distance along the surface of a solid insulating material between two conductive
parts, or between a conductive part and the bounding surface (accessible part) of the
equipment, measured along the surface of insulation
[SOURCE: IEC 60050-151:2001, 151-15-50, modified — "or between a conductive part and
the bounding surface (accessible part) of the equipment, measured along the surface of
insulation" has been added.]
3.1.15
direct contact
electrical contact of persons with live parts
[SOURCE: IEC 60050-826:2004, 826-03-05, modified — "or animals" has been deleted.]
3.1.16
double insulation
insulation comprising both basic insulation and supplementary insulation

Analogue/digital inputs and outputs, complying with ELV voltage limits.

EXAMPLE 3

Connections to ELV terminations of other products.

Note 1 to entry: ELV circuits should not be accessible under normal operational conditions.

[SOURCE: IEC 60255-27:2013, Table A.1]
3.1.18
enclosure
housing affording the type and degree of protection suitable for the intended application
[SOURCE: IEC 60050-195:1998, 195-02-35]
3.1.19
equipment
single apparatus or set of devices or apparatuses, or a set of main devices of an installation,
or all devices necessary to perform a specific task
Note 1 to entry:
equipment.
Note 2 to entry:

Examples of equipment are a power transformer, the equipment of a substation, measuring
For the purpose of this standard, equipment is utility communication and automation equipment.

[SOURCE: IEC 60050-151:2001, 151-11-25, modified — Note 2 to entry has been added.]
3.1.20
equipment under test
EUT
equipment submitted to a test, including any accessories, unless otherwise specified

3.1.21
exposed conductive part
conductive part of electrical equipment, which is accessible and which is not normally live, but
which may become live under a single-fault condition
Note 1 to entry: For equipment which is not enclosed, the frame, the fixing devices, etc., may form the exposed
conductive parts.
Note 2 to entry: For equipment which is enclosed, the conductive parts which are accessible when the equipment
is mounted in its normal position of use, including those of its fixing surface, form the exposed conductive parts.

[SOURCE: IEC 60050-826:2004, 826-12-10, modified — Notes 1 and 2 to entry have been
added.]

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– 12 –

– 13 –

3.1.22
fire enclosure
part of the equipment intended to minimize the spread of fire or flames from within
[SOURCE: IEC 60255-27:2013, 3.19]
3.1.23
functional earthing
functional grounding, en US
earthing a point or points in a system or in an installation or in equipment, for purposes other
than electrical safety
[SOURCE: IEC 60050-195, Amendment 1:2001, 195-01-13]
3.1.24

functional insulation
insulation between conductive parts, necessary for the proper functioning of the equipment
[SOURCE: IEC 60050-195:1998, 195-02-41]
3.1.25
hazardous energy level
available power level of 240 VA or more, having a duration of 60 s or more, or a stored energy
level of 20 J or more (for example, from one or more capacitors), at a potential of 2 V or more
[SOURCE: IEC 60255-27:2013, 3.22]
3.1.26
hazardous live part
live part at a voltage exceeding 33 V a.c. or 70 V d.c.
[SOURCE: IEC 60050-826:2004, 826-12-13, modified — The voltage values have been
provided.]
3.1.27
HLV
hazardous live voltage
normal operational condition voltage which exceeds 33 V a.c. or 70 V d.c.
[SOURCE: IEC 60255-27:2013, 3.23]
3.1.28
HBF class foamed material
foamed material tested in the thinnest significant thickness used and classified HBF according
to ISO 9772
[SOURCE: IEC 60255-27:2005, 3.27]
3.1.29
HB40 class material
material tested in the thinnest significant thickness used and classified HB40 according to
IEC 60695-11-10
[SOURCE: IEC 60255-27:2013, 3.25]

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61850-3 © IEC:2013

61850-3 © IEC:2013

3.1.30
HB75 class material
material tested in the thinnest significant thickness used and classified HB75 according to
IEC 60695-11-10
[SOURCE: IEC 60255-27:2013, 3.26]
3.1.31
high-integrity
high-integrity part or component is considered not to become defective in such a manner as to
cause a risk of hazard within the sense of this standard
Note 1 to entry: A high-integrity part or component is considered as not subject to failure when a single-fault
condition is applied.

[SOURCE: IEC 60255-27:2013, 3.27]
3.1.32
limited-energy circuit
circuit that meets all the criteria given in 7.12 of IEC 60255-27:2013
[SOURCE: IEC 60255-27:2013, 3.28]
3.1.33
live part
conductor or conductive part intended to be energized in normal operational use, including a
neutral conductor
Note 1 to entry:

This concept does not necessarily imply a risk of electric shock.

[SOURCE: IEC 60050-195:1998, 195-02-19, modified — "but by convention not a PEN
conductor or PEM conductor or PEL conductor" has been deleted.]
3.1.34
micro-environment
ambient conditions which immediately surround the clearance and creepage distance under
consideration excluding self-produced pollution resulting from normal operation of the
accessory
Note 1 to entry: The micro-environment of the creepage distance or clearance and not the environment of the
equipment determines the effect on the insulation.

[IEC 60050-442:1998, 442-01-29, modified — Note 1 to entry has been modified.]
3.1.35
non-primary circuit
circuit electrically isolated from the a.c. or d.c. supply and from external VTs and CTs
[SOURCE: IEC 60255-27:2013, 3.32]
3.1.36
normal operational use
equipment installed and operated under normal operational conditions, with all covers and
protective measures in place
[SOURCE: IEC 60255-27:2013, 3.33]

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– 14 –

– 15 –

3.1.37

overvoltage category
number defining a transient overvoltage condition
Note 1 to entry:

Overvoltage categories I, II, III are used.

Note 2 to entry:

See Clause A.1 of IEC 60255-27:2013 for overvoltage category details.

[SOURCE: IEC 60255-27:2013, 3.35]
3.1.38
PEB circuit
protective equipotential bonding circuit
non-primary circuits complying with ELV voltage limits and the following conditions:
•

basic protection against electric shock is provided by basic insulation separating HLV from
PEB circuits; and

•

for fault protection, PEB circuits and accessible conductive parts, shall be bonded to the
protective conductor terminal and shall comply with clause 6.6.5, which will prevent
hazardous live voltages in PEB circuits

EXAMPLE 1
circuits.

Analogue/digital inputs and outputs which may be connected direct to communication networks or

EXAMPLE 2

PEB ports which are suitable for connection to PEB ports of other products.

Note 1 to entry:

See IEC 60255-27:2013, Figure A.3.

Note 2 to entry:
fault conditions.

PEB circuits may be accessible and are safe to touch under both normal operational and single-

Note 3 to entry: PEB circuits may be considered as protective earthed circuits or earthed accessible parts for the
purposes of IEC 60255-27:2013, Table A.2.

3.1.39
PELV circuit
protective extra low voltage circuit
non-primary circuits complying with ELV voltage limits and the following conditions:
•

PELV circuits shall be separated from HLV by reinforced/double insulation; and

•

PELV circuits may be connected to functional earth, the protective (earth) conductor, or
have provision for an earth connection

EXAMPLE 1
circuits.

Analogue/digital inputs and outputs which may be connected directly to communication networks or

EXAMPLE 2

PELV ports which are suitable for connection to PELV ports of other products.

Note 1 to entry:

See IEC 60255-27:2013, Figure A.2.

Note 2 to entry: PELV circuits may be accessible and are safe to touch under both normal operational and singlefault conditions.

3.1.40
pollution
any addition of foreign matter, solid, liquid or gaseous that can produce a permanent
reduction of dielectric strength or surface resistivity of the insulation
Note 1 to entry:

Ionized gases of a temporary nature are not considered to be a pollution.

[SOURCE: IEC 60050-442:1998, 442-01-28]
3.1.41
pollution degree
number characterizing the expected pollution of the micro-environment

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61850-3 © IEC:2013

61850-3 © IEC:2013

[SOURCE: IEC 60255-27:2013, 3.39]
3.1.42
pollution degree 1
normally no pollution or only dry, non-conductive pollution occurs. The pollution has no
influence
[SOURCE: IEC 60255-27:2013, 3.40]
3.1.43
pollution degree 2
normally only non-conductive pollution occurs except that occasionally a temporary
conductivity caused by condensation is to be expected
[SOURCE: IEC 60255-27:2013, 3.41]
3.1.44
pollution degree 3
normally conductive pollution, or dry non-conductive pollution occurs, which becomes
conductive, due to condensation which is to be expected
[SOURCE: IEC 60255-27:2013, 3.42]
3.1.45
pollution degree 4
normally the pollution generates persistent conductivity caused by conductive dust or by rain
or snow
[SOURCE: IEC 60255-27:2013, 3.43]
3.1.46
primary circuit
circuit connected direct to the a.c. or d.c. supply input. Equipment circuits connected to VTs
or CTs are also classed as primary circuits

Note 1 to entry:

See IEC 60255-27:2013, Annex B.

Note 2 to entry: Measuring relay circuits supplied from an external a.c. or d.c. power supply, complying with ELV
circuit requirements, as in IEC 60255-27:2013, Table A.1, may be treated as non-primary circuits, providing that
any transients or impulse voltages on the supply output do not exceed the requirements of Figure 2 of
IEC 61010-1:2010.

[SOURCE: IEC 60255-27:2013, 3.44]
3.1.47
product family
range of products based on a common hardware and/or software platform
[SOURCE: IEC 60255-1:2009, 3.17]
3.1.48
protective bonding
electrical connection of exposed conductive parts or of protective screening to provide
electrical continuity by means of connection to an external protective conductor which is
securely returned to earth/ground
[SOURCE: IEC 60255-27:2013, 3.45]

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– 16 –

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3.1.49
protective bonding resistance

impedance between the protective conductor terminal and a conductive part required to be
connected to the protective conductor
[SOURCE: IEC 60255-27:2013, 3.46]
3.1.50
protective conductor
conductor provided for purposes of safety, for example, protection against electric shock, by
electrically connecting any of the following parts:
•

main earthing terminal;

•

exposed conductive parts;

•

earth electrode;

•

earthed point of the source or artificial neutral

[SOURCE: IEC 60050-195:1998, 195-02-09, modified — "by electrically connecting any of the
following parts: main earthing terminal, accessible conductive parts, earth electrode, earthed
point of the source or artificial neutral" has been added.]
3.1.51
protective earthing
protective grounding, en US
earthing of a point in equipment for protection against electric shock in case of a fault

[SOURCE: IEC 60255-27:2013, 3.48]
3.1.52
protective impedance
impedance connected between live parts and exposed conductive parts, of such value that
the current, in normal use and under likely fault conditions in the equipment, is limited to a
safe value, and which is so constructed that the reliability is maintained throughout the life of
the equipment
Note 1 to entry:
A protective impedance should withstand the dielectric voltage withstand test for double
insulation, and its choice should take account of its predominated failure mode.

[SOURCE: IEC 60050-442:1998, 442-04-24, modified — the term "electronic switch" has been
replaced by "equipment" and Note 1 to entry has been added.]
3.1.53
protective screening
protective shielding, en US
separation of electric circuits and/or conductors from hazardous live parts by an electrically
protective screen connected to the protective equipotential bonding system and intended to
provide protection against electric shock
[SOURCE: IEC 60050-195, Amendment 1:2001, 195-06-18]
3.1.54
protective separation
separation of one electric circuit from another by means of
•

double insulation, or

•

basic insulation and electrically protective screening, or

•

reinforced insulation

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61850-3 © IEC:2013

61850-3 © IEC:2013

[SOURCE: IEC 60255-27:2013, 3.51]
3.1.55
rated impulse voltage
impulse voltage value assigned by the manufacturer to the equipment or to a part of it,
characterizing the specified withstand capability of its insulation against transient
overvoltages and to which clearances are referred
[SOURCE: IEC 60255-27:2013, 3.52]
3.1.56
rated insulation voltage
RIV
voltage value assigned by the manufacturer to the equipment, or to a part of it, characterizing
the specified (long-term) withstand capability of its insulation and to which dielectric voltage
tests and creepage distances are referred
Note 1 to entry: The rated insulation voltage is not necessarily equal to the rated voltage of equipment which is
primarily related to functional performance.
Note 2 to entry:

The rated insulation voltage refers to the insulation between electric circuits.

Note 3 to entry: For clearances and solid insulation the peak value of the voltage occurring across the insulation
or clearance is the determining value for the rated insulation voltage. For creepage distances, the r.m.s. or d.c.
value is the determining value.

[SOURCE: IEC 60255-27:2013, 3.53]
3.1.57
rated voltage
value of voltage assigned by the manufacturer, for a specified operating condition of a
component, device or equipment
Note 1 to entry:

Equipment may have more than one rated voltage value or may have a rated voltage range.

[SOURCE: IEC 60255-27:2013, 3.54]
3.1.58
reinforced insulation
insulation of hazardous live parts which provides a degree of protection against electric shock
equivalent to double insulation
Note 1 to entry: Reinforced insulation may comprise several layers which cannot be tested singly as basic
insulation or supplementary insulation.

[SOURCE: IEC 60050-195:1998, 195-06-09]
3.1.59
restricted access area
area accessible only to electrically skilled persons and electrically instructed persons with the
proper authorization and knowledge of any safety hazards
Note 1 to entry: These areas include closed switch plants, distribution plants, switchgear cells, transformer cells,
distribution systems in metal-sheet enclosures or in other closed installations.

[SOURCE: IEC 60050-195:1998, 195-04-04, modified — "and knowledge of any safety
hazards" and Note 1 to entry have been added.]
3.1.60
routine test
conformity test made on each individual item during or after manufacture

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